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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Equity-Based Compensation | Stockholders' Equity Common Stock Plans We have stock-based compensation plans under which restricted stock awards and stock options are outstanding or granted subject to time or performance vesting requirements. At June 30, 2024, approximately 0.5 million shares were available for future issuance under our current plan.
| Quarter Ended June 30, |  | Six Months Ended June 30,
| 2024 | 2023 |  | 2024 | 2023
Total stock-based compensation expense | $ | 4.7 |  | $ | 1.5 |  |  | $ | 8.1 |  | $ | 3.4 |
Income tax benefit related to stock-based compensation | $ | 1.0 |  | $ | 0.4 |  |  | $ | 1.3 |  | $ | 0.9 |
Impact on cash flow from proceeds on options exercised | $ | 1.1 |  | $ | — |  |  | $ | 1.1 |  | $ | — |
Impact on cash flow due to taxes paid related to net share settlement of equity awards | $ | 0.8 |  | $ | 0.4 |  |  | $ | 3.9 |  | $ | 4.6 |
At June 30, 2024, there was $19.0 million of total unrecognized compensation costs related to outstanding restricted stock unit awards. During the six months ended June 30, 2024, we granted 221,319 restricted stock units (time vesting) at an average grant date fair value of $38.18 per share and 163,310 restricted stock units (performance vesting) at an average grant date fair value of $40.17 per share.

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